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      Java lambda表达式-箭头函数
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        <p>jdk8+以上引入了箭头函数，即J8的lambda表达式。</p>
<p>Lambda表达式的本质只是一个”<a href="http://zh.wikipedia.org/wiki/语法糖" target="_blank" rel="noopener"><strong>语法糖</strong></a>“，由编译器推断并帮你转换包装为常规的代码，因此你可以使用更少的代码来实现同样的功能。</p>
<blockquote>
<p>本人建议不要乱用,因为这就和某些很高级的黑客写的代码一样,简洁,难懂,难以调试,维护人员想骂娘，哈哈</p>
</blockquote>
<p>下面是例子：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. 不需要参数,返回值为 5  </span></span><br><span class="line">() -&gt; <span class="number">5</span>  </span><br><span class="line">  </span><br><span class="line"><span class="comment">// 2. 接收一个参数(数字类型),返回其2倍的值  </span></span><br><span class="line">x -&gt; <span class="number">2</span> * x  </span><br><span class="line">  </span><br><span class="line"><span class="comment">// 3. 接受2个参数(数字),并返回他们的差值  </span></span><br><span class="line">(x, y) -&gt; x – y  </span><br><span class="line">  </span><br><span class="line"><span class="comment">// 4. 接收2个int型整数,返回他们的和  </span></span><br><span class="line">(<span class="keyword">int</span> x, <span class="keyword">int</span> y) -&gt; x + y  </span><br><span class="line">  </span><br><span class="line"><span class="comment">// 5. 接受一个 string 对象,并在控制台打印,不返回任何值(看起来像是返回void)  </span></span><br><span class="line">(String s) -&gt; System.out.print(s)</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">//////////// 用法 //////////////</span></span><br><span class="line"></span><br><span class="line">String[] atp = &#123;<span class="string">"Rafael Nadal"</span>, <span class="string">"Novak Djokovic"</span>,  </span><br><span class="line">       <span class="string">"Stanislas Wawrinka"</span>,  </span><br><span class="line">       <span class="string">"David Ferrer"</span>,<span class="string">"Roger Federer"</span>,  </span><br><span class="line">       <span class="string">"Andy Murray"</span>,<span class="string">"Tomas Berdych"</span>,  </span><br><span class="line">       <span class="string">"Juan Martin Del Potro"</span>&#125;;  </span><br><span class="line">List&lt;String&gt; players =  Arrays.asList(atp);  </span><br><span class="line">  </span><br><span class="line"><span class="comment">// 以前的循环方式  </span></span><br><span class="line"><span class="keyword">for</span> (String player : players) &#123;  </span><br><span class="line">     System.out.print(player + <span class="string">"; "</span>);  </span><br><span class="line">&#125;  </span><br><span class="line">  </span><br><span class="line"><span class="comment">// 使用 lambda 表达式以及函数操作(functional operation)  </span></span><br><span class="line">players.forEach((player) -&gt; System.out.print(player + <span class="string">"; "</span>));  </span><br><span class="line">   </span><br><span class="line"><span class="comment">// 在 Java 8 中使用双冒号操作符(double colon operator)  </span></span><br><span class="line">players.forEach(System.out::println);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">String[] players = &#123;<span class="string">"Rafael Nadal"</span>, <span class="string">"Novak Djokovic"</span>,   </span><br><span class="line">    <span class="string">"Stanislas Wawrinka"</span>, <span class="string">"David Ferrer"</span>,  </span><br><span class="line">    <span class="string">"Roger Federer"</span>, <span class="string">"Andy Murray"</span>,  </span><br><span class="line">    <span class="string">"Tomas Berdych"</span>, <span class="string">"Juan Martin Del Potro"</span>,  </span><br><span class="line">    <span class="string">"Richard Gasquet"</span>, <span class="string">"John Isner"</span>&#125;;  </span><br><span class="line">   </span><br><span class="line"><span class="comment">// 1.1 使用匿名内部类根据 name 排序 players  </span></span><br><span class="line">Arrays.sort(players, <span class="keyword">new</span> Comparator&lt;String&gt;() &#123;  </span><br><span class="line">    <span class="meta">@Override</span>  </span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">compare</span><span class="params">(String s1, String s2)</span> </span>&#123;  </span><br><span class="line">        <span class="keyword">return</span> (s1.compareTo(s2));  </span><br><span class="line">    &#125;  </span><br><span class="line">&#125;);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">// 1.2 使用 lambda expression 排序 players  </span></span><br><span class="line">Comparator&lt;String&gt; sortByName = (String s1, String s2) -&gt; (s1.compareTo(s2));  </span><br><span class="line">Arrays.sort(players, sortByName);  </span><br><span class="line">  </span><br><span class="line"><span class="comment">// 1.3 也可以采用如下形式:  </span></span><br><span class="line">Arrays.sort(players, (String s1, String s2) -&gt; (s1.compareTo(s2)));</span><br></pre></td></tr></table></figure>


      
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